I just put strict and warnings into my code and now I remember why I don't do that with this software :)

When a user-specified block of code is evaluated, some variables are already created in it's scope. If you use those variables in your code and then enable strict and warnings the application won't save your code to run later.

I side-stepped the warnings with the ever-so-icky my $pre_set_var if 0; construct (which I learned about here just a few weeks ago!)

Anyhow, I've enabled strict and warnings and even diagnostics, but I've still no clue how to get the stuff those spit out on STDERR into a log file for an embedded interpreter!